Electrical resistance material.



UNITED STATES PATNT OFFICE.

ADELBERT O. BENEOKE., OF NEWARK, NEW JERSEY, ASSIGNOR TO AMERI- CAN INSTRUMENT COMPANY, OF

TION OF NEW JERSEY.

NEWARK, NEIN JERSEY, A CORPORA- Specification of Letters Patent.

Patented Dec. 25, 1906.

Application filed January 5, 1906. Serial'No. 294.769.

To all whom it may concern: v

Be it known that I, ADELBERT OBENECKE, of the city of Newark, county of Essex, and State of New Jersey, have invented a new and useful Improvement in Electrical Resistance Material, of which the following is a descri tion.

Hit ierto resistance devices for the general purpose to which my invention is adapted were constructed of rectangular strips of mica or asbestos, around Which the .resistance-Wire is spirally Wound and secured-in convenient manner at the ends of such strips. The difficulty with. such a construction is princi ally in the limited resistance capacity of such strips and their incapability of conform-ing to the shape of the ments in which they are used.

The object of my invention is to provide a continuous metallic strip of any length covered with insulating l material and spirally various instruwound 4with. a resistance-wire and the whole cover this thereafter covered with insulating material, so that the process of manufacture may be continuous and the product may be of any desired length and capable of being bent in any shape or coiled in spirals to suit any purpose for which it may be adapted.

In the accompanying drawings, forming a part of this specification, Figure 1 represents a section of a resistance-strip, illustrating the various steps in the process of manufacture. Fig. 2 illustrates one form, and Fig. '3 still another form, which the completed product may take. Fig. 4 illustrates a ortion of the end of a stri showing the meth ing the leading-out and -the leading-in contact. Fi 5 is a 'cross-section on line x of Fig. 4. ig. 6 illustrates another form of end connection. Fig. 7 illustrates a modified form of resistance-strip, and Fig. 8 illustrates another modified form.

The metal base-strip A may be of any length desired or convenient to manipulate, which metallic ribbon or strip A, I cover with a spirally-Wound ribbon B, of paper, silk, or other suitable insulating material. I may paper, &c., after it has been a plied to the strip A with a coat of varnis ut in many cases I find this to be unnecessary. U on the ribbon or strip as thus insulated I) wind the resistance-Wire O, as shown, continuously throughout the 1cngth od of attachof the strip and thereafter cover the same with the spirally-wound strip of paper, silk, or other suitable insulating or protective material D. A long strip or coil thus constructed maybe kept in stock and short lengths cut oil?, as desired, for any purpose for which the same may be used.

In Fig. 4 I have shown a means of attaching a leading-out contact. rIhis is done by punching the apertures E through the end of the strip, first removing a portion of the protecting strip of material D and the wire C for some distance. After punching, the strip D is restored to cover the apertures, and thereafter the flexible strip or contactpieceE is lapped around the end and compressed into the apertures, as shown in Fig. 5. The end of the wire O is then lapped u on the contact-piece E and soldered or ot er- 'wise secured thereto at O2, after which the covering B may be restored as far as may be deemed necessary in order to properly protect the convolutions of the Wire C. The structure of Fig. 6 is substantially the same asv that described in connection with Figs. 4 and 5, the exception being that the contactpiece E2 projects longitudinally 'of the strip, while the contact-piece E projects laterally. I am able to produce practically the same results by coating the metal strip A with varnish, over which the convolutions of the wire C lie, and thereafter I cover the wire with the coat of varnish D', as illustrated in Fig. 7. In this manner I am able to produce a continuous metallic strip of any length to give the necessary required resistance and to fold, coil, or bend the same in any desired manner to fit the instrument in which the resistance-stripmay be used. This resistance material possesses the added advantage of conducting away or absorbing the heat generated in the wire C, because of the relatively large mass of metal in the strip A.

Al resistance-strip constructed along the lines I have indicated characteristics above dition, the advantages of non-inductivity and very small capacity, which advantages will be readily recognized by those skilled in the art to which my invention pertains.

In each of the several forms of my invention the wire C maybe either bare or covered, and in case I use the ribbon I may use possesses not only the noted, but has, in ad- IOC covered or insulated Wire to provide the necessary insulation between the Wire itself and the metallic base strip or ribbon, as shown in Fig. 8. l I/Vhere such covered Wire is used, it is not necessary to use the protective strip D, although I prefer to use such strip or covering as a safeguard against accidental abrasion of the insulating-covering of the Wire and the almost inevitable contactoi successive convolutions and consequent short-circuiting of the resistance-Wire. I

In Figs. 4, 5, and 6 I have shown the contact-strips il as secured to the ends of the resistance-strip, With the Wire C soldered to the contact-piece. Inasniuch as this contact-piece E 1s insulated from the base strip or ribbon A in case of the use of metallic base or ribbon, I may connect the other-end ofthe Wire to said base and use the end thereof for 'direct external connection.

What I claim is l. An electrical resistance material composed of a continuous flexible metallic strip -or ribbon, an insulating-covering for said strip or ribbon and a resistance-Wire, spirally Wound upon said strip or ribbon throughout its-length.

2. An. Yelectrical resistance material composed ei a continuous iiexible metallic ribbon, and insulating-covering for said metallic ribbon, a high-resistance Wire spirally wound upon said covering and a protective covering outside of said spirally-Wound Wire.

3. An electrical resistance material comosed of a continuous flexible metallic strip high-.resistance Wire spirally or ribbon, a

insulated from sald strip or Wound upon an ing for said ribbon throughout its length and insulating material covering said spirally-Wound Wire.

4. An electrical resistance material composed of a long flexible metallic ribbon', an insulating-covering for said ribbon, a highresistance Wire spirally Wound upon said covering throughout the len th'oi` the ribbon, and an insulating-covering or the Whole.

5. All electrical resistance material com posed of a long'ribbon of metal, a ribbon of insulating material spirally Wound upon said metal ribbon toy form an insulating-cover therefor, a high -resistance Wire spirally Wound upon said insulating-cover throughout the length of said metal ribbon.

6. An electrical resistance device, consisting of a strip or ribbonof flexible metal, a high-resistance 'Wire spirally Wound u on'and insulated from said rlbbon and a lea ing-out contact secured to the end oi said ribbon, said contact being directly connected with one end yof said resistance-Wire.

7. An electrical resistance device, consisting ci an insulated flexible metallic strip or ribbon,a Ahigh-resistance Wire spirally Wound upon said stripI or ribbon, a protective coverresistance and vleading-out contacts secured upon the ends oi said ribbon, said contacts being directly connected With said Wire and insulated from said metallic ribbon. j y

This speciiication signed and witnessed this 2d day oi January, 1906'.

ADELBERT O. BENECKE. Witnesses:

LoUrs M. SANDERS, FREDK. C. FISCHER. 

